Valid HTTP session no longer invalidated when HttpSession not accessed

Fixes gh-188

spring-session/src/main/java/org/springframework/session/web/http/SessionRepositoryFilter.java

@@ -163,6 +163,7 @@ public class SessionRepositoryFilter<S extends ExpiringSession> extends OncePerR
 	private final class SessionRepositoryRequestWrapper extends HttpServletRequestWrapper {
 		private HttpSessionWrapper currentSession;
 		private Boolean requestedSessionIdValid;
+		private boolean requestedSessionInvalidated;
 		private final HttpServletResponse response;
 		private final ServletContext servletContext;
 
@@ -239,7 +240,7 @@ public class SessionRepositoryFilter<S extends ExpiringSession> extends OncePerR
 		}
 
 		private boolean isInvalidateClientSession() {
-			return currentSession == null && isRequestedSessionIdValid();
+			return currentSession == null && requestedSessionInvalidated;
 		}
 
 		@Override
@@ -372,6 +373,7 @@ public class SessionRepositoryFilter<S extends ExpiringSession> extends OncePerR
 			public void invalidate() {
 				checkState();
 				this.invalidated = true;
+				requestedSessionInvalidated = true;
 				currentSession = null;
 				sessionRepository.delete(getId());
 			}

spring-session/src/test/java/org/springframework/session/web/http/SessionRepositoryFilterTests.java

@@ -19,6 +19,7 @@ import static org.fest.assertions.Assertions.assertThat;
 import static org.junit.Assert.fail;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.eq;
+import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -1077,6 +1078,31 @@ public class SessionRepositoryFilterTests<S extends ExpiringSession> {
 		verify(strategy).onInvalidateSession(any(HttpServletRequest.class),any(HttpServletResponse.class));
 	}
 
+	// gh-188
+	@Test
+	public void doFilterRequestSessionNoRequestSessionDoesNotInvalidate() throws Exception {
+		filter.setHttpSessionStrategy(strategy);
+
+		doFilter(new DoInFilter(){
+			@Override
+			public void doFilter(HttpServletRequest wrappedRequest, HttpServletResponse wrappedResponse) throws IOException {
+				wrappedRequest.getSession().getId();
+			}
+		});
+
+		HttpServletRequest request = (HttpServletRequest) chain.getRequest();
+		String id = request.getSession().getId();
+		when(strategy.getRequestedSessionId(any(HttpServletRequest.class))).thenReturn(id);
+
+		doFilter(new DoInFilter(){
+			@Override
+			public void doFilter(HttpServletRequest wrappedRequest, HttpServletResponse wrappedResponse) throws IOException {
+			}
+		});
+
+		verify(strategy,never()).onInvalidateSession(any(HttpServletRequest.class),any(HttpServletResponse.class));
+	}
+
 	// --- order
 
 	@Test